A few questions:

[Do0ks]

First, the theme is super clean and easy to customize. Worth it!! 

• I see in headline include, 
  
  Code:

  <link rel="stylesheet" type="text/css" href="https://cheattables.net/skin.css.php">

         Though, referenced file was included in the source files for the theme, it still errors. Is this discontinued?

• Related, the theme is also things calling for skin.css, but no referenced file was included in the source files. Again, discontinued?
  

• I see a script reaching out to your site, though its throwing errors for me. I temporary disabled it. What is this for?
  
  Code:

  <script>
    $(document).ready(function(){
    $.ajax({
        url: "https://developement.design/theme_users.php?url="+window.location.href+"&theme=emeraldextended",
        method: "GET"
    })

    .done(function(response){
        console.log('D&D done');
    })

    .fail(function(error){
        console.log('D&D failed');
    })

});
</script>
  
  
• The color chooser seems to be throwing errors for sinks.css.php, and style.css, It seems to be a database error, but the files have the necessary permissions. Does this have to do with the above JavaScript failing to reach your site? I can only assume as they all seem to be related.
  

To Add:

For whatever reason, the theme has broken upload functionality. When trying to upload something it doesent attach to the thread. A work around to this is updating "post_attachments_new" with

Code:

<tr>
<td class="trow1" width="1"><img src="{$theme['imgdir']}/paperclip.png" alt="" /></td>
<td class="trow1" style="white-space: nowrap"><strong>{$lang->new_attachment}</strong> <input type="file" name="attachments[]" size="30" class="fileupload" multiple="multiple" /></td>
<td class="trow1" style="white-space: nowrap" align="center">{$attach_update_options} {$attach_add_options}</td>
</tr>
<tr style="display: none;">
<td class="trow1" colspan="3">
<div id="upload_bar" style="background: #0066A2; height: 5px; width: 0%;"></div>
<div id="dropzone" style="padding: 50px 0; margin: 5px 10px 10px; cursor: pointer; border: 2px dashed #CCC; text-align: center;">
<div style="pointer-events: none;"></div>
</div>
</td>
</tr>

This adds the ability to drag and drop files too.

Thanks!!!